A radioactive substance has a half life of one day. If you start with 100 grams of this substance, how much will be left after 2 days? *
100 g
50 g
25 g
12.5 g

Which statement best describes how atoms combine to form sodium chloride (nacl)? a. a positively charged sodium ion and a positively charged chlorine ion form an covalent bond. b. a positively charged sodium ion and a negatively charged chlorine ion form an covalent bond. c. a positively charged sodium ion and a positively charged chlorine ion form an ionic bond. d. a positively charged sodium ion and a negatively charged chlorine ion form an ionic bond.

Draw the structure for 5-isopropyl-2-methyl-3-nonene

How is the atomic number of a nucleus changed by alpha decay